The teacher, along with his students, _____ experiments in the laboratory when the explosion happened. [ ]A. were doing B. have been doing C. was doing D. h-高中英语-n多题

◎ 题干

The teacher, along with his students, _____ experiments in the laboratory when the explosion happened.

A. were doing
B. have been doing
C. was doing
D. had done

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◎ 解析

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◎ 知识点

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◎ 相似题

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